/**
   A class to compare numbers.
*/
public class Numbers
{
   /**
      Checks whether three numbers have all the same sign.
      @return true if all of the numbers a, b, and c have the same sign
   */
   public boolean allSameSign(int a, int b, int c)
   {
      if(a>0 && b>0 && c>0) return true;
      else if(a==0 && b==0 && c==0) return true;
      else if(a<0 && b<0 && c<0) return true;
      else return false;
   }
}